On Tue, Apr 13, 2010 at 04:32:12PM +0900, william dunand wrote:
> Dear list,
>
> I am currently setting up two 4.6 boxed to act as carp'ed firewalls.
[...]
> Even though I got to quite satisfying results, I am confused about the
> net.inet.carp.preempt definition given in the carp(4) man page:
>
> a) Allow virtual hosts to preempt each other.
>
> b) It is also used to failover carp interfaces
> as a group. When the option is enabled and
> one of the carp enabled physical interfaces
> goes down, advskew is changed to 240 on all
> carp interfaces. See also the first example.
> Disabled by default.
>
> I have no problem to observe [a], but I really can't manage to make [b]
> happens.
>
> So when one of my interfaces goes down, all carp interfaces are
> failing over to the other node but it seems to be thanks to the
> demotion of "carp" group. A you can see below, advskew on the other
> hand does not change at all:
[...]
> Would anyone be so kind as to explain me what I am misunderstanding here ?
Hi,
the advskew bump to 240 is done internally and not visible with
ifconfig. Run tcpdump(8) and you'll see it on the wire.
However, the 240 bump has been deprecated with 4.7 and the current manpage
doesn't mention it either :)
Marco
